fork doesn't copy anything
Even though I have been working with Linux exclusively for the last 3 years, I still 'default' to Solaris in my *nix response :(. Linux only initially copies the page tables (very small). Solaris, on the other hand, does copy all of the address space (unless you use vfork). In both environments, text (ie code) pages are read-only. I am 99% sure that in Solaris, text pages are only ever put into physical memory once (which includes the text portion of shared libs once they are loaded the first time), and referenced by all processes using them. For Linux, it would not matter in this case, since pages are copy-on-write, and text pages can never be written to (hence, they would never be copied).

fnord

In reply to Re^3: Fork and multiple subs by Illuminatus
in thread Fork and multiple subs by msalerno

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